12729467521 has 2 divisors, whose sum is σ = 12729467522. Its totient is φ = 12729467520.

The previous prime is 12729467503. The next prime is 12729467539. The reversal of 12729467521 is 12576492721.

It is a balanced prime because it is at equal distance from previous prime (12729467503) and next prime (12729467539).

It can be written as a sum of positive squares in only one way, i.e., 10091207025 + 2638260496 = 100455^2 + 51364^2 .

It is a cyclic number.

It is not a de Polignac number, because 12729467521 - 2¹³ = 12729459329 is a prime.

It is not a weakly prime, because it can be changed into another prime (12729465521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6364733760 + 6364733761.

It is an arithmetic number, because the mean of its divisors is an integer number (6364733761).

Almost surely, 2^12729467521 is an apocalyptic number.

It is an amenable number.

12729467521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12729467521 is an equidigital number, since it uses as much as digits as its factorization.

12729467521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 46.

The spelling of 12729467521 in words is "twelve billion, seven hundred twenty-nine million, four hundred sixty-seven thousand, five hundred twenty-one".